Forcing or forced; -- a direction placed over a note, to signify that it must be executed with peculiar emphasis and force; -- marked fz (an abbreviation of forzando), sf, sfz, or /. [1913 Webster]
, adj., adv., & n. (also sforzato)
--adj. & adv. Mus. with sudden emphasis.
--n. (pl. -os or sforzandi)
1 a note or group of notes especially emphasized.
2 an increase in emphasis and loudness.
Etymology
It., verbal noun and past part. of sforzare use force